Li Feng, Thickett Stuart C, Maya Fernando, Doeven Egan H, Guijt Rosanne M, Breadmore Michael C
Australian Centre for Research on Separation Science (ACROSS), School of Natural Sciences (Chemistry), University of Tasmania, Hobart, Tasmania 7001, Australia.
School of Natural Sciences (Chemistry), University of Tasmania, Hobart, Tasmania 7005, Australia.
ACS Macro Lett. 2020 Oct 20;9(10):1409-1414. doi: 10.1021/acsmacrolett.0c00465. Epub 2020 Sep 8.
A dual-wavelength photopolymerization process is presented, allowing for the volumetric fabrication of complex geometries using a multistep process. The methacrylate-based resin contained 0.1 wt % camphorquinone/0.1 wt % ethyl 4-(dimethylamino) benzoate and 0.2 wt % bis[2-(ochlorophenyl)-4,5-diphenylimidazole] as photoinitiator (473 nm) and photoinhibitor (365 nm), respectively. The photoinitiator and photoinhibitor concentrations were optimized to allow for photocuring to full depth (4.6 mm) following an exposure time of 2 min solely by 473 nm light, but no curing occurred when 365 nm light was present due to photoinhibition. This resin was validated using one-step volumetric fabrication of two objects containing voids defined by the 365 nm irradiation region. Two more complex structures were printed in a step-by-step manner, relying on the dynamic control of the projection patterns of both 365 and 473 nm projectors, decreasing the print time from 20 min using a commercially available single wavelength resin printer to 2 min.
本文介绍了一种双波长光聚合工艺，该工艺允许通过多步工艺对复杂几何形状进行体积制造。基于甲基丙烯酸酯的树脂分别含有0.1 wt%的樟脑醌/0.1 wt%的4-(二甲基氨基)苯甲酸乙酯和0.2 wt%的双[2-(邻氯苯基)-4,5-二苯基咪唑]作为光引发剂(473 nm)和光抑制剂(365 nm)。光引发剂和光抑制剂的浓度经过优化，使得仅用473 nm光照射2分钟后就能光固化至全深度(4.6 mm)，但由于光抑制作用，当存在365 nm光时不会发生固化。使用一步体积制造法对两个包含由365 nm照射区域定义的空隙的物体验证了这种树脂。通过逐步依赖365 nm和473 nm投影仪投影图案的动态控制，打印了另外两个更复杂的结构，将打印时间从使用市售单波长树脂打印机的20分钟减少到了2分钟。
